EP 0720048 A2 19960703 - Photographic element containing pyrazolone pug releasing coupler and imaging process employing same
Title (en)
Photographic element containing pyrazolone pug releasing coupler and imaging process employing same
Title (de)
Photographisches Element das einen Pyrazolon-Pug-freisetzenden Kuppler enthält und Bildverfahren das dieses verwendet
Title (fr)
Elément photographique contenant un coupleur libérant un groupe photographiquement utile et procédé de formation d'image l'utilisant
Publication
Application
Priority
US 36665994 A 19941230
Abstract (en)
The invention provides a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a 1-aryl-2-pyrazolin-5-one coupler bearing a 4-aryloxy coupling-off group containing a group capable of releasing a photographically useful group (PUG) wherein: (1) the 1-aryl-2-pyrazolin-5-one ring contains a 3-cyano substituent or a substituent linked to the 3-position by an acyl group, thio group, sulfoxide group, sulfone group, or a tetrahedral carbon atom which tetrahedral carbon atom has bonded thereto three other atoms or substituent groups for which the sum of the Taft sigma * values is at least 1.5; and (2) the 4-aryloxy coupling-off group: (a) contains ring substituents selected so that the sum of the Hammett's sigma constants for all substituents on the aryloxy ring is at least 0.3 but does not contain a nitro substituent in the position ortho to the oxygen atom bonded to the pyrazolone ring; and (b) contains (i) in at least one position ortho or para to the oxygen atom bonding the aryloxy group to the pyrazolone ring comprising a tetrahedral carbon atom bonded to a PUG or to another timing group which timing group is in turn bonded to a PUG directly or through a further timing group, or (ii) in a position ortho to the oxygen atom bonding the aryloxy group to the pyrazolone ring a carbamate group (with or without a methylene group bridge to the aryloxy ring) bonded to a PUG or to another timing group which timing group is in turn bonded to a PUG directly or through a further timing group; and provided that one or more of the aryloxy ring members or ring substituents may join to form one or more additional rings.
IPC 1-7
IPC 8 full level
G03C 7/305 (2006.01); G03C 7/384 (2006.01)
CPC (source: EP US)
G03C 7/30529 (2013.01 - EP US); G03C 7/384 (2013.01 - EP US); Y10S 430/156 (2013.01 - EP); Y10S 430/158 (2013.01 - EP)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
US 5670306 A 19970923; DE 69523429 D1 20011129; DE 69523429 T2 20020627; EP 0720048 A2 19960703; EP 0720048 A3 19960724; EP 0720048 B1 20011024; JP H08234386 A 19960913
DOCDB simple family (application)
US 73055896 A 19961015; DE 69523429 T 19951219; EP 95203565 A 19951219; JP 34161395 A 19951227